Device for attaching pressure-gages to boilers



(No Model.)

0. G. LUDLOW. DEVICE FOR ATTAGHING PRESSURE GAGES TO BOILERS.

No. 495,594. Patented Apr. 18, 1893.

FIG. 2

Rf 7 A m: "cams arr-ms 00 mom-mun. WAsnlNmoN n c UNITED STATES PATENT OFFICE.

CHARLES GIBBONS. LUDLOW, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE CROSBY STEAM GAGE AND VALVE COMPANY, OF BOSTON, MASSACHUSETTS.

DEVICE FOR ATTACHING PRES SURE-GAGES'TO BOILERS.

SPECIFICATION forming part of Letters Patent No. 495,594, dated April 18, 1893.

Application filed January 22, 1892. Serial No. 418,923. (No model.)

T at whom it may concern.-

Be it known that 1, CHARLES GIBBONS LUD- LOW, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in a Device for Attaching Pressure-Gages to Steam-Boilers; and I do hereby declare the following to be a full, clear,

and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use-the same.

The object of the present invention is to so attach steam gages to boilers that steam will not enter the gage, and the invention consists in the construction hereinafter pointed out.

Referring to the drawings: Figure 1 represents a steam boiler oi the ordinary type, showing this improved method of attachment of the steam gage to it, so that water only of the boiler flows into it. Fig. 2 represents a cross section through the line 2-2 as appears in Fig. 1. Fig. 3 represents an enlarged view of the rear portion of the valve, D, in eleva- 'tion. Fig. 4 represents a longitudinal sectional View of the valve, D, through line 4- 4, Fig. 3. Fig. 5 represents a horizontal sectional View of valve, D, through the line 5 5, Fig. 3.

In the annexed drawings: The letter A ino dicates a boiler having the water line, a a.

into this bore, (1 is a hole, d closed by a plug, 40 d At a right angle to the bore, (Z and communicating therewitluis another bore, 6 the bores, d and c forming a passage through the trap, D. The bore, 6 is made in an upturned portion, E, of the trap, D, and to this portion, E, is secured a coupling, F, for the pipe, 0, leading to the steam gage, B. At the angle of the trap, D, is formed a cup, G, having the threads, g, whereto is held a plug, H, carrying the valve, I. This plug, I-I, does not completely fill the cup, G, but there is a small chamber, g, which communicates with the outer air by a hole, g, and with the bore, 01 of the trap, D, by a passage, 9 this passage being closed by the valve, I. With such an attachment as this there is always a column of water in the pipe, C, and, therefore, steam never enters the gage, B.

Should there be any sediment in the trap, D, it may be blown out through the passage, g chamber, g, and hole, g. The valve, H, is normally closed, but may be opened to allow of the blow off. Scale may be removed through the hole, (i by removing the plug, d Having thus described my invention, what I claim is-- The combination of a boiler; a steam gage; and a pipe leading from the boiler to the gage; with a trap D. erected in said pipe below the water line of the boiler, such trap having the bores d e communicating with each other, the cup G having the chamber g communicatin g with the bore d by passage g and with the outer air by the hole g, the valve I c011- trolling the passage g and a plug 01 closing thehole d leading into the bore d as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES GIBBONS LUDLOW.

Witnesses:

VAN S. DRESSER, NEWTON WYETH. 

